By Michael Tedder Four out of five Americans have a streaming moocher on their accounts. Plenty of people either let their adult child, ex-partner or best friend use their Netflix (NFLX) – Get Netflix, Inc. Report or HBO (T) – Get AT&T Inc. Report account — or are the best friend or adult child using someone else’s accounts. Now, at least one streaming service is slowly taking steps to put a stop to it. Netflix recently announced plans to roll out a feature in Chile, Costa Rica and Peru that will charge users a little bit extra for sharing their accounts (i.e., letting people use their passwor…